Note 11 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	December 31
	2023			2022
Net operating loss carryforwards	$	17,734		$	14,264
Stock options and warrants		1,090			1,151
Property and equipment		310			(46	)
Intangible assets		688			875
Capitalized expenses		105			117
Other		440			655
Operating right-of-use lease assets		-			-
Operating right-of-use lease liabilities		124			167
Net deferred tax assets		20,491			17,183
Less: Valuation allowance		(20,491	)		(17,183	)
Deferred tax asset (liability)	$	-		$	-

Summary of Valuation Allowance [Table Text Block]

	2023			2022
Valuation allowances, beginning of year	$	17,183		$	15,456
Net operating loss and other temporary differences		3,974			1,997
Expiration of net operating losses and limitations		(33	)		(90	)
Adjustment to deferred taxes		(159	)		(197	)
Impact of state tax rate change		(404	)		22
Other		70			(5	)
Valuation allowance, end of year	$	20,491		$	17,183

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

	2023			2022
Pre-tax income (loss)	$	(8,539	)	$	(6,641	)
Income tax benefit at federal statutory rate	$	(1,796	)	$	(1,646	)
Increase (decrease) resulting from:
State tax benefit, net of federal tax effect		(189	)		(421	)
Effect of change in state tax rate		404			(22	)
Change in valuation allowance		3,308			1,727
Expirations of net operating losses and application of IRC 382 limitation		33			90
Fair value adjustments and others		(1,960	)		5
Other nondeductible expenses		53			89
Adjustments to deferreds		159			197
Income tax expense	$	12		$	19